Continuity mistake: As Lex is telling Dark Superman that he is acting out of character, his desk is clear. Then while they are talking, a paper suddenly appears on his desk that he gives to Superman. (00:51:55)
Continuity mistake: In the overhead shot of the cat in the tree with the old lady, you can see the small stairs behind the lady with nothing beside them but a tree. It cuts to the cat in the tree then to the lady, and suddenly two trashcans appear beside the stairs under the window. The tree is not big enough to have covered both of them up in the previous shot. (00:50:00)
Continuity mistake: When we first see the old woman with her cat stuck in a tree, it's a higher angle showing the cat. This shot shows the cat is near the center of the tree on the left side of the tree, right where the tree splits off into two even sides. But then it cuts to a close up of the cat, and suddenly the cat is further out on a much smaller branch, and now on the other side of the tree as can tell by the way the limb is shaped. (00:49:55)
Continuity mistake: After Superman wakes up and sees the robot reviving him, the camera pulls back to a far shot to show him on an operating table with a machine beside him on each side, and a board with digital display behind the robot. When it cuts to Superman's perspective of the robot, the machine to his left changes shape some, and the display on the board is a little different, most noticeably the part in the bottom middle has a pointed corner instead of a cut off corner. (00:47:15)
Continuity mistake: As Lois is dragging Jimmy, by his ear ring, into the ally beside the Nite Club, it cuts to a different view from inside the ally. And suddenly a street light pole appears next to the building, the side walk is much thinner, the ledge outside the window on the red building vanishes, and the lighting on the side walk changes. As well as an additional row of panes appear on the yellow window. (00:44:40)
Continuity mistake: Once Jimmy sees Lois outside the Nite Club, he comments on what she is wearing. In the first shot, he has the strap of his camera around his neck and down his chest. It cuts to a close up as he makes his remark and suddenly the strap is gone. Then in the next shot after Lois grabs him by his earring, the strap is back, but only over one shoulder. Also in the shot where the strap vanishes, the people around him instantly change around. (00:44:30)
Continuity mistake: After Lois gets off the phone with Martha, the scene changes to just outside the Nite Club. A car pulls up and two girls get out, a blond and a redhead. When they get out in the high shot, the blond is on the right and the redhead on the left. Then it cuts to a frontal close up of the girls and they switch positions. (00:44:15)
Continuity mistake: When Lois is on the phone with Martha Kent, the guy she was awkwardly staring at moments before is seen in his cubicle where Clark once was. A paper suddenly appears pinned on the wall next to his painting. (00:43:55)
Continuity mistake: There are some papers pinned to the wall of Lois cubicle as she is awkwardly staring at the new co-worker that is in Clark's spot. A bit later when she answers the phone to Martha Kent, the papers have moved closer to the edge of the cubicle wall. (00:43:55)
Revealing mistake: As Lex is walking away from the container that holds Superman's body, the glass of the container is reflected in the floor, as is Superman's body. But the little pedestal that he is hovering above is not reflected. (00:43:30)
Continuity mistake: Lex has Kryptonite jewels on the knuckles of the metal gloves he wears when he is beating up Superman in the ‘Rumpus Room'. After he knocks Superman down and is climbing on top of him, the Kryptonite has vanished, but as soon as he stops moving, they reappear in the same shot. (00:41:55)
Continuity mistake: Lex holds up his Kryptonite gloves and is about to beat up Superman in the ‘Rumpus Room'. When he holds up his right hand it cuts to a close up and one of the joints on his thumb piece disappears, making it a 2 piece part where it was 3 pieces. (00:41:30)
Continuity mistake: When Superman enters the ‘Rumpus Room', the red solar lamps turn on and there are lots of red hexagons on the ceiling and floor that glow as well. Throughout the entire scene, the red hexagons are never consistent in size and position from one shot to the next. It is most noticeable when Superman hits the ground after Lex's assault and the hexagons are roughly the size of his ear. But then in the high shot, they are bigger than his whole head. (00:41:15 - 00:42:20)
Continuity mistake: As Superman is walking up to the room that Lex is leading him to, it opens up and there is the red and green panel of the door on the side, but on the metal of the door frame. It then cuts to a closer, higher angle and suddenly the panel is beside the door frame on the wall. (00:41:10)
Continuity mistake: When Superman is walking through the mazelike area in Lex Corp looking for Lex, he walks down a hall that has multiple tiles and stuff on the floor. It cuts to a different angle as he reaches the end of it and suddenly the hall is much more narrow, and the tiles become singular and bigger. (00:40:55)
Continuity mistake: In the overhead shot of Superman standing in Lex's office, he is standing on a stage like area raised with small stairs. The circle he is standing on is a gold color with some blue towards the outside then a gold ring. And Superman is standing almost dead center. A couple of shots later, without him moving, it shows Superman's feet and now he is standing closer to the edge, and the circle is now totally blue except for the gold ring around it. (00:40:45)
Continuity mistake: Once Toyman throws the bus off the roof, you can see the police cars on the street below and how they are arranged. It then cuts to a view from inside the buss at Lois and the little girl hanging on for dear life and out the back window of the bus you can see the police cars. Only the ones visible are not in any way like the patterns you could see previously. They rearranged themselves. (00:37:35)
Continuity mistake: When Lois is sneaking up to the door of the school bus, you can see the front wheel appears to be one solid piece all the way around and in the spokes and center. But a bit later as she is leading the children off the bus, there are now gaps between the spokes and the center is hollow. The wheels change several times in this scene. Also the front bumper suddenly becomes elongated. The headlight is also missing from the first shot and reappears. (00:36:05)
Continuity mistake: As Superman is returning Lois to her apartment after rescuing her from Toyman, he goes to land on the balcony outside her room. It is first shown as small with only a table and one plant on it. But as soon as Superman lands, it is suddenly a lot bigger and a lot more stuff is on it. (00:39:25)
Continuity mistake: Trying to kill Lois and the little girl, Toyman uses his spider mech to slice the seats in the school bus in half. But when Superman catches the bus and sets it down safely, the seats are just fine, not cut or damaged at all. (00:37:50)
Answer: In the comic book, Doomsday was put in a strait-jacket, strapped in metal bondage and placed in a cube like metal prison buried deep in the earth. It took him centuries just to break the bonds, then spent more centuries just punching his way out. With earthquakes, volcanoes and other natural disasters those events could shift Doomsday's prison to the surface.